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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8a23a61cdb635e0369c47ea43cda5ced37bdbbfc1bdfffc74ed136577a35eade' 
  AND token = 'J1ysSKQL5BxBBVYTY0rbIKUxYGiX33++X1F2b40yZ1k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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