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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb2d846e8bc52b0acb014b18f16abe4d5c08386911e75213b2cff062ec5eef18' 
  AND token = 'mRJFGfckghJXMQNn8brtLmvN4jVeXKx9BCfrku25RfQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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