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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0e961cfaa583c5ee1d0307d35e9eb36da1e59909c64dc32039dd7a81d8a23e07' 
  AND token = '+Cd0ggWHW/Ce3np9md2MClPzCVPdIDjxh5HVxjoQqIA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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