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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd20ae76709515dd8c2e45cd25fc88cb3e19f392c43b881949594a00af37e8b72' 
  AND token = 'aW8s7HzNMrYlSt8nyK4bbN/t4u/9DlF7Mv0/XS/JZOI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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