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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '472694fe7cabfd22027e03acaa966d03e8598de6e6e06c885d9538a2b9087a74' 
  AND token = '9sEOblLBWTaKxA+x3z+4Rbw4c6ovHpEYL/ksElaZ5oc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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