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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6364c850e4251a26188e18dd4c6e7ca365c3535aabeb66a490467be8a28c9d03' 
  AND token = 'CiFsjFO1jtuArw2VavCFsCGk7yp78W/cl3gwYLuFP+s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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