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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ac4009d647a737e29d265fd468787b3124a6d87182b4c64a0925dafd221ba26' 
  AND token = 'wHgen+CcA53yEaNJKqrAUEgAL91uZNGq2gzq+y3EGQY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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