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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a40be6b17ff4344229a73d0894f441e8c2bfd74df8e3d4a8444646339851856d' 
  AND token = 'MPRkwh/fjiQJ0U+h/Us0B2P4L+daLX4PNdhuknBAPg0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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