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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3b5a42112557fc1ade95f0a573c02499321f06b90ef8b0a6850d2a65d9977db7' 
  AND token = 'Q9SSY5rFX4uRH/ejnyyivgtX4rrXx0pqXmPVEtnzLaQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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