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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '145d62e277102ba6d617adcb9026389d2ba550cb337ec88d04c75e8a85d077d7' 
  AND token = '9r5eIKIy6cKdU3Q5irJFSzaps7nGXSVYzQS5PEghfnU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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