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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be9213d907aeb2287e902e51f82f5333255d3cd6a80954fae43d912822c5b6c6' 
  AND token = '/2choBh8+lT6DbwC9SbbFXfNWZpNvpZvSPcH6gJZn28=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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