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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f9a1e1cbefe480a983c9d6e3fb7e2c166cb6ff4e714dbca07d6d5f79fe581112' 
  AND token = 'GL1QE4/1Shq8fArq3l39MhDqSTemvdx72NnaknR0BIk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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