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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f4434ebccb7bd67969725515def1b319108f802e8a51f0bad5ce4479cfc9f7e' 
  AND token = '0NdpeNxFjJIxOy6cx/IVufAf4Xr0GPS6tHp+5/S186c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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