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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '80befcd32c547ca78a083051d00f45dc9fc78fb89b7ef3d99ab03ab6e5917eea' 
  AND token = 'OfyCCtEcYPLzEy5Ts/Pv0N8ckQ0ADo0cTM7y4IRqnko=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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