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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bedf5611bd0f90399978be32b94a642c33edc34f3639a071ca46edbdab4770be' 
  AND token = '/1/AcP0k2bFrWGHw1DpNhn89/T7Knez2sOOFr3tUjn8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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