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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '38ae0ac9277cfcdbf904aaffa9ef1f17a41b110a2eff0eda66db97e13e0cfb6e' 
  AND token = 'kFyP89SuJMu9uY+87gSpXy4SaeDTvNHIzkQ4PCG67As=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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