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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d8bdb371bab71098dbfb8a3489413cabbb2fb485138ae166f0d416bcd7b4875' 
  AND token = 'wr+A++NF/Jz8+fZgv8zfq1byK5ZGFKvfEJWDMO01swE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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