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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f5ad87d9e2cf8b936018f4c0a4b56af9865217df2a598e725f4cdb4cc3251b23' 
  AND token = 'dehExZVSx/6aeE8Yzzqk/8n8ZtjLVfNvu/ETxsTsfV4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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