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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '104418d590e5a941ce8b372dcda823f7b331f3e9f5575421b5becd5b081e57c1' 
  AND token = 'omWLym797QymcqP9SpzdOrkAr/Iqw/bqfBiOnR2sCtM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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