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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '44977aaebf648aabe4ba1c03beeddf84f7a1a19ba1b4c931ed65d8ecb4850bd4' 
  AND token = '7njlssbO3ALHjWWYpyk28rUNBCn2qkPvZw6TsX+HdJk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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