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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9819df2aac4b5ec8a6b962e9d344429f5cbba62a9704cd1526c00acaac5291c7' 
  AND token = 'OEMvBpVwg0xH6m0UzIzxlVH5dCGv1XtX3TZaE2QpRMk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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