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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '36c999cf4f386fa6a6f42a336082145397ec95a7e2aa159cc029cd8a3599de78' 
  AND token = 'NOLk+h303GrjxyE9zgJfF31Ma/mky2ySN9JnoRdEss0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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