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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c07e08df2d9c8d5a270a3d614eeb704acf28026409f460d89fe75d72fd99c6df' 
  AND token = 'SISxxsePyhr3k3IQbD7rb+7S9FnlU4GmvdGtnnQEVD0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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