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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6d34908045ffd24253f88cd6bc03fb23c1c95edb1ce1255d5aa95c5d10cabc4a' 
  AND token = '0vfG0XPTxoRpELRHWirNm/TtYJxo9fl/w4H2th4gzB0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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