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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6eb91b5729b1074b5759fcd55dd9294ea36f77a2025a7b1e40830a10cf4b4d34' 
  AND token = 'AVMzRpTjF+M9QtpeqHa0LubdOMai3elifBhSIA3kvNE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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