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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8530f3b7b3b152301abf79586b4857765f5c89a7e13e28b330f95a1196809c41' 
  AND token = 'SJ7xH+3nKWYjMIqrIFbhABxTf7c8CE544vIkbBnthNo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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