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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0995182df4e1e7bf18b61103dec72cb1395571abae0a6cf85e321bf20a0ddd38' 
  AND token = 'OTlvhB53qaMgjzk1HvWJuGmyaEouD5oFm0DqVCraGJg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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