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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2b3fdd8b07a2eb4551f0b48840e1d2c6db6ea0ee29de4d52d1dd3004c213b98b' 
  AND token = 'Pm/R9yO5jfOCkhPA/hY69o9Igxmz3HVQGsK7DCGyIPo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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