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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e0a10e1f7ac207d6e1aebaa4f3c63b50e6759c99ea84be73795e82f7e56f267b' 
  AND token = 'DTK0fz8Me5jDHRBEg9sUP4joN/c4FqrHuQsq1wxPYpk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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