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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c52deba3e4fc30bdec7d946ade76424d46c2f98fad3a9d359237fe92d0e2d639' 
  AND token = 'FBLZNPHTXUuzq4DMEgR5MJTQmruba/R3DLox5M+bkvM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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