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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '70e078cf4ce2b289acf825274c73666fcbd78b08401bf7ba3cfbcf8f790aa58a' 
  AND token = '/r8fMtBiK5uWEuGs8tG90k7n9yGw6XtKFHT1utOsEIQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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