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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9c15b413e8c0e33f497cc148c60c3e1a9c2648434eb8d5aa8e42cbfc7d3a4ce5' 
  AND token = 'Q0LlJJY8qezFxO5Aftwv8ERg6dQJJ630KeDpQolIbOU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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