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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f33935457153c70fbb1974c454db2407e85ab2e1e5c8bb5e991cd2644982e334' 
  AND token = 'I9Ba1x0uDe2g0M9GU9hnlfU94m87R3BkEOKYLdvyMb0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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