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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5dfba9e6eef28aa90f5a27fa2e95c07b37cd67b89696e492aa5fce4d946c133a' 
  AND token = '8fAviHwZtNt/fVx4WsCL0eogWnlbcCd4XNgWgVplEfI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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