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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd139c16341d93258738ec4fa8c32fc1c907a84cca2e203bb663e50bf123409a8' 
  AND token = 'BmRfLcOu45NfQCSc4dWJu2QX0MLJyC0vBm41aIGSWXk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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