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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c5f00845455210d31e9c82654df7d18ebf42825bde05243605f42b8f4b15df31' 
  AND token = 'iH0aDKFqM5KXzQ8RG/KrOmHI9LVP2Xzra8W+irO8MMM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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