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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f682e886f6954014508bcd297c59b0697dbb5ee132fecbcf1ff64d7c17579aad' 
  AND token = 'oY9c0QgKWfLk976NzQbrFWPHdEdXP/POWOyGeZ9vwkI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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