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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a629690b06cf314a1a86062715c5f1bc9f436cec69e8f84667f427feb7ef49d3' 
  AND token = '/ueOSHX+zem3gRrB1drFUHV8qPCQ3luOiZmuIbWU7bM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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