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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a947e4266b55cce7bd5c9b0b5e7d8ab5adff090b592390bf9b52484f3da9243a' 
  AND token = '7l2gfbfruqHY6NmsIwVp3bYrOtmpcirEFu+DJ3qItOE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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