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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '74571a8c1fc9865cbc22d73adc62a379f5b7ed362f23f26dd2b777c8bd139a40' 
  AND token = 'l7GwUVYbawZKmQvxJIshY1SIWDhULvnNU72sRDDeveE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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