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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6cc7fd6dde3bc92a2185466901b884d1f0251f894e8547b152bee5027e65f548' 
  AND token = '6y5/nEP+nS71hDa/ZEhewe15zarCQGZBUeu1s6x7ado=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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