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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b32d6d39787ef337e049471e19cffc34f139b9aa6868286099299c0b569dfbf5' 
  AND token = 'RTUhh3PmGblF8ECf1Dl1oIg6dtXZ9rK4m9OTX0cLrHs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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