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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '62058c6e323a71dcb5a6c8196de023776bad8b819f5f08500d58fef6b4f4aaa8' 
  AND token = '+XpEhbvIOMH2CCpviy9YqAS/fhIxJvJtSIb+lMF3V+0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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