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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '572b674fd1b9aca0f3381a5e0416891e50bd446611c8813eb945673a3f200fa1' 
  AND token = '1nedKWGA+OisHE2RpgCXxN5tzeISLF/js8XEgFEOI3A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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