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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e91775a5c66e417f9ad6055e80a0a3973496ae64d78cf59831ad190e483c6edd' 
  AND token = 'LGXCU3DTD0O5Z3xGQXY1xvQ8t1q8t1pIfuKv2pjOBpg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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