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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2bb083f360fa8a8e25ab32f50bcfd900d4dde6b1bb103474b0c2fee5da454e08' 
  AND token = 'NohFN9p8cpWNhXAuIMIB7yqk5he3wHTRCYljtauy4y4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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