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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '942d0bad679793d0bfcc1e95fe0f6a67b96b998e1a155432fd6c95e59776266d' 
  AND token = 'i1zzWIKWv78sjsmXXk81USV6DWX17KKjFAeMMnSeE/4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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