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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e06a5d35c7a945e1768d38e5e5706f0b6d298b389ec5d8aea1112ba89f67d050' 
  AND token = 'sHdLckNpoQ6c+H/b4Iza1+P4TwCvFcVbqksKzmIRHXc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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