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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '01c17825bcb76c34fa768e5255c4dae81001ee14a707aa826b440ac9a9eabc9b' 
  AND token = 'oC5tK3zliSuvKAnw5saB8U+3WED6nTTYlRb15gQQyVI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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