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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8ab6ee61a53a78da3fcd192f84440bf6930152350580dc2c026b696ad6d34b83' 
  AND token = '+/RkYDRRE8ru4vhtr8RA6+qfbJK88KCppBcK267jgmE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}