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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '66d13730f838c8e6a6f6f4367a643489feda166e2efab7611e73260ad1fdc34c' 
  AND token = 'peI7lzAddS3K2gVwjM/79yw2ejv5L+FXtxFxhpRiQ1k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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