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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '62a58963322a640d9f07f62b014a0f4d2ada955274ed5e6247a0e95e98084001' 
  AND token = 'u12lRjHUdmTPcOtrb/khyywtS5CgcPIO7k2BJnwJzBg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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