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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fab0cccf4e23d039bace0f3ca9037f470d934c210ae8914a58aded0497f97c97' 
  AND token = 'O6kZEu/995DtogQhtTofqdL2rJIG8GG9UYANnBd3gEo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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